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Table 1 Characteristics of study participants

From: Involvement of tryptophan hydroxylase 2 gene polymorphisms in susceptibility to tic disorder in Chinese Han population

Characteristic TD children Controls P
  (n = 149) (n = 125)  
Sex (n,%)
Male 112(75.17) 84(67.20)  
Female 37(24.83) 41(32.80) 0.470a
Age (Mean ± SD) 8.90 ± 2.78 8.62 ± 2.61 0.220b
Male 8.92 ± 2.76 8.92 ± 2.94 1.000b
Female 8.84 ± 2.92 7.98 ± 1.99 0.129b
Age of onset (year) 6.67 ± 2.80   
ADHD comorbidity (n,%)
TD only 114(76.51)   
TD + ADHD 35(23.49)   
YGTSS (n,%)
low score subgroup 36(23.68)   
high score subgroup 116(76.32)   
  1. Abbreviations:
  2. TD only, children with only tics.
  3. TD + ADHD, children with tics and ADHD.
  4. a Chi-square test was used to calculate the p- values.
  5. b t test was used to calculate the p- values.